From: Kyungwoo Kang <kwoo.kang@samsung.com>
Date: Mon, 20 Nov 2017 01:48:23 +0000 (+0900)
Subject: [COMMON] i2c: exynos5: Add NACK service routine & property
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=3ceeb9468121eca47e43b4f03fbe49dc1c7b05c0;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

[COMMON] i2c: exynos5: Add NACK service routine & property

Change-Id: I299b23346b51266719fb908390e01989dcf2fe92
Signed-off-by: Kyungwoo Kang <kwoo.kang@samsung.com>
---

diff --git a/drivers/i2c/busses/i2c-exynos5.c b/drivers/i2c/busses/i2c-exynos5.c
index fe9cf3095646..ab3f10d4fdec 100644
--- a/drivers/i2c/busses/i2c-exynos5.c
+++ b/drivers/i2c/busses/i2c-exynos5.c
@@ -112,6 +112,7 @@ static LIST_HEAD(drvdata_list);
 #define HSI2C_INT_RX_OVERRUN			(1u << 5)
 #define HSI2C_INT_TRAILING			(1u << 6)
 #define HSI2C_INT_I2C				(1u << 9)
+#define HSI2C_INT_NODEV				(1u << 10)
 #define HSI2C_RX_INT				(HSI2C_INT_RX_ALMOSTFULL | \
 						 HSI2C_INT_RX_UNDERRUN | \
 						 HSI2C_INT_RX_OVERRUN | \
@@ -563,6 +564,13 @@ static irqreturn_t exynos5_i2c_irq(int irqno, void *dev_id)
 		dev_err(i2c->dev, "HSI2C Error Interrupt "
 				"occurred(IS:0x%08x, TR:0x%08x)\n",
 				(unsigned int)reg_val, (unsigned int)trans_status);
+
+		if (reg_val & HSI2C_INT_NODEV) {
+			dev_err(i2c->dev, "HSI2C NO ACK occured\n");
+			if (i2c->nack_restart)
+				goto out;
+		}
+
 		i2c->trans_done = -ENXIO;
 		exynos5_i2c_stop(i2c);
 		goto out;
@@ -1012,6 +1020,12 @@ static int exynos5_i2c_probe(struct platform_device *pdev)
 	else
 		i2c->reset_before_trans = 0;
 
+	if (of_get_property(np, "samsung,no-dev-restart", NULL))
+		i2c->nack_restart = 1;
+	else
+		i2c->nack_restart = 0;
+
+
 	i2c->idle_ip_index = exynos_get_idle_ip_index(dev_name(&pdev->dev));
 
 	strlcpy(i2c->adap.name, "exynos5-i2c", sizeof(i2c->adap.name));
diff --git a/drivers/i2c/busses/i2c-exynos5.h b/drivers/i2c/busses/i2c-exynos5.h
index 2e7f59c34339..8717b614ebb6 100644
--- a/drivers/i2c/busses/i2c-exynos5.h
+++ b/drivers/i2c/busses/i2c-exynos5.h
@@ -59,5 +59,6 @@ struct exynos5_i2c {
 	int			idle_ip_index;
 	int			reset_before_trans;
 	unsigned int		runtime_resumed;
+	int			nack_restart;
 };
 #endif /*__I2C_EXYNOS5_H */